Collaborative Research: Full-Holocene Decadal-Scale Isotopic Paleoclimate Record from Speleothems, Oregon Coast Range

该项目将使用俄勒冈州西南部的洞穴，该地区受到来自太平洋的海洋气团的严重影响，在北美西部开发新的和创新的高分辨率记录。太平洋西北地区现有的年代确定的气候记录显示了年际到年代际的变化，但跨度仅为最近~500年，因此无法解决高频气候变化是否在更长的时间间隔内是一个持续的特征。研究人员将通过从洞穴中获取十年尺度的记录来填补这一科学空白。他们的主要科学目标是记录全新世期间大气-海洋-陆地相互作用是如何影响北美的。该项目还将探索北半球西风带纬度带的全新世气候变化之间的联系，西风带进入北美，其他地区，如北大西洋，似乎对太阳辐射的准周期性强迫作出反应，以及赤道太平洋。其中厄尔尼诺-南方涛动（ENSO）事件的频率和强度被假设以复杂的方式变化，以响应地球轨道在全新世的逐渐变化。该项目所产生的科学成果将有助于从近海岸地点开发太平洋西北部区域气候的高分辨率（年代际）记录。这些记录有望提高对过去气候变率的认识，并加强对未来气候变化的预估。本科生、研究生和博士后学者将参与这项研究，从而为参与和贡献新兴探究领域的研究提供了一个极好的机会。这项研究的结果将被翻译成俄勒冈洞穴国家纪念碑的游客的教育产品。

This project will use speleothems from southwestern Oregon, a region that is heavily influenced by maritime air masses emanating from the Pacific Ocean, to develop new and innovative high-resolution records in western North America. Available well-dated climate records from the Pacific Northwest show interannual-to-decadal variability but span only the last ~500 years and are thus unable to address whether high-frequency climate variability is a persistent feature over longer time intervals. The researchers will fill this science gap by obtain a decadal-scale records from speleothems. Their main scientific objective is to document how coupled atmosphere-ocean-terrestrial interactions have affected North America during the Holocene. The project will also explore linkages between Holocene climate variability in the latitude band of the northern hemisphere Westerlies where they enter North America, and other regions such as the North Atlantic, which appears to respond to quasi-periodic forcing by solar irradiance, and the equatorial Pacific, in which the frequency and intensity of El Nino-Southern Oscillation (ENSO) events are hypothesized to have changed in complex ways in response to gradual changes in Earth's orbit through the Holocene.The science resulting from this project will aid in the development of high-resolution (decadal) records of regional climate in the Pacific Northwest from a near-coastal site. These records are expected to improve understanding of past climate variability, and enhance projections of future climate change. Undergraduate and graduate students and postdoctoral scholars will be involved in this study thereby providing an excellent opportunity to participate and contribute to research in an emerging field of inquiry. The results of this research will be translated into educational products for visitors to Oregon Caves National Monument.